1780
MariaDBERRORNotableDDLHIGH confidence
ALTER TABLE requires COPY algorithm
Production Risk
Medium — DDL blocked; requires table lock during COPY.
What this means
The ALTER TABLE operation explicitly requires ALGORITHM=COPY and cannot be performed using INPLACE or INSTANT.
Why it happens
- 1Changing column data type in a way that requires a full table rebuild.
- 2Re-ordering columns which requires COPY.
How to reproduce
trigger — this will error
trigger — this will error
ALTER TABLE tbl ALGORITHM=INPLACE, MODIFY COLUMN val BIGINT; -- some type changes need COPY
expected output
ERROR 1780 (0A000): ALGORITHM=INPLACE is not supported for this operation. Reason: Requires COPY.
Fix
Execute the ALTER with ALGORITHM=COPY
Execute the ALTER with ALGORITHM=COPY
ALTER TABLE tbl ALGORITHM=COPY, LOCK=SHARED, MODIFY COLUMN val BIGINT;
Why this works
Forces a full table rebuild which accommodates any column change.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1780 ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_COPY
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